62 lines
2.1 KiB
ArmAsm
62 lines
2.1 KiB
ArmAsm
/* $NetBSD: byte_swap_2.S,v 1.6 2013/08/19 03:44:18 matt Exp $ */
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/*-
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* Copyright (c) 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Charles M. Hannum.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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#if defined(_KERNEL) || defined(_STANDALONE)
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#define FUNC _C_LABEL(bswap16)
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#else
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#define FUNC _C_LABEL(__bswap16)
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#endif
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ENTRY(FUNC)
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#ifdef _ARM_ARCH_6
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rev16 r0, r0
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#elif !defined(__thumb__)
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and r1, r0, #0xff
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mov r0, r0, lsr #8
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orr r0, r0, r1, lsl #8
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#else
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movs r2, #0xff
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movs r1, r0
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ands r1, r1, r2
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lsls r1, r1, #8
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lsrs r0, r0, #8
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ands r0, r0, r2
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orrs r0, r0, r1
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#endif
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RET
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END(FUNC)
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#if BYTE_ORDER == LITTLE_ENDIAN
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STRONG_ALIAS(_C_LABEL(ntohs), FUNC)
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STRONG_ALIAS(_C_LABEL(htons), FUNC)
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#endif
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